One-pot synthesis of some 2<i>H</i>-Pyran-2-one derivatives
作者:Vladimir Kepe、Marijan Kočevar、Slovenko Polanc
DOI:10.1002/jhet.5570330626
日期:1996.11
A one-potsynthesis of various 2H-pyran-2-onederivatives 5–19 starting from methyl ketones 1, N,N-dimethylformamide dimethyl acetal and N-acylglycines 3 in acetic anhydride is described.
A Way to Avoid Using Precious Metals: The Application of High-Surface Activated Carbon for the Synthesis of Isoindoles via the Diels–Alder Reaction of 2<i>H</i>-Pyran-2-ones
The application of activatedcarbon (Darco KB) for the acceleration and direction of the transformation of various 2H-pyran-2-ones with N-substituted maleimides toward isoindole derivatives through the reaction sequence cycloaddition/elimination/dehydrogenation is described. In this reaction, the catalyst mainly influences the dehydrogenation step, which is essential to avoid the formation of bicyclo[2
活性炭(Darco KB)在加速2和N转化为2 H -pyran-2-one方面的应用描述了通过反应序列环加成/消除/脱氢向异吲哚衍生物取代的马来酰亚胺。在该反应中,催化剂主要影响脱氢步骤,这对于避免形成双环[2.2.2]辛烯以及其他可能的产物至关重要。我们发现,在密闭容器中,Darco KB(无金属催化剂)和十氢化萘(作为溶剂)的组合代表了最成功的条件。还比较了各种脱氢催化剂的效果和反应条件。此外,我们已经证明,芳香化是通过氢从环己二烯中间体转移到马来酰亚胺衍生物(因此产生琥珀酰亚胺)而发生的。非均相碳基催化剂的活性表面促进了这种转移。
Enhancing a Neat Microwave-Assisted Transformation. Diels–Alder Reaction of 2<i>H</i>-Pyran-2-ones toward Fused Bicyclo[2.2.2]octenes
作者:Krištof Kranjc、Marijan Kocevar
DOI:10.1246/bcsj.80.2001
日期:2007.10.15
An efficient, green access to polysubstituted and highly constrained bicyclo[2.2.2]octenes via a microwave-assisted cycloaddition reaction is described. The double Diels–Alder reaction of a series ...